Didn't Betty recently break out Thor's barehug? She would seem to be in his ballpark strength-wise going by her feats and she has her new hulked out She-Hulk form on top.
Thor should ko regular She-Rulk with Mjolnir pretty much everytime but I think it would be a good fight if both were unarmed.
I think plenty of people with strength significantly lower than that of Thor's could perform that feat, so long as they were strong enough to stagger him.
She hit him on the nose with the back of her head while apparently simultaneously trying to break free (Flexing outward). If it was just the latter, we'd have a good gauge of how she compared to him strength wise but with the former included? It becomes a lot less about being on a certain level of strength.